Page "Antigen" Paragraph 13
from
Wikipedia
Exogenous antigens are antigens that have entered the body from the outside, for example by inhalation, ingestion, or injection.
By endocytosis or phagocytosis, exogenous antigens are taken into the antigen-presenting cells ( APCs ) and processed into fragments.
APCs then present the fragments to T helper cells ( CD4 < sup >+</ sup >) by the use of class II histocompatibility molecules on their surface.
Cytokines are substances that can activate cytotoxic T lymphocytes ( CTL ), antibody-secreting B cells, macrophages, and other particles.
Page 1 of 1.
2.099 seconds.